Maker : National Semiconductor
Part No. : LM317HVT

  Datasheet PDF : LM317HVT.pdf
  Cross Reference : LM317HVT Cross Reference
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Shortcut : LM317HV  LM317HVH  LM317HVK STEEL  LM317HVT 

Product Information

LM117HV/LM317HV 3-Terminal Adjustable Regulator April 2000 LM117HV/LM317HV 3-Terminal Adjustable Regulator General Description The LM117HV/LM317HV are adjustable 3-terminal positive voltage regulators capable of supplying in excess of 1.5A over a 1.2V to 57V output range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also, the LM117HV is packaged in standard transistor packages which are easily mounted and handled. In addition to higher performance than fixed regulators, the LM117HV series offers full overload protection available only in IC’s. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejections ratios which are difficult to achieve with standard 3-terminal regulators. Besides replacing fixed regulators, the LM117HV is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e. do not short the output to ground. Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM117HV can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current. The LM117HVK STEEL and LM317HVK STEEL are packaged in standard TO-3 transistor packages, while the LM117HVH and LM317HVH are packaged in a solid Kovar base TO-39 transistor package. The LM317HVT uses a TO220 plastic package. The LM117HV is rated for operation from −55˚C to +150˚C, and the LM317HV from 0˚C to +125˚C. Features n n n n n n n n n n n Adjustable output down to 1.2V Guaranteed 1.5A output current Line regulation typically 0.01%/V Load regulation typically 0.1% Current limit constant with temperature 100% electrical burn-in Eliminates the need to stock many voltages Standard 3-lead transistor package 80 dB ripple rejection Output is short-circuit protected P+ Product Enhancement tested Typical Applications 1.2V-45V Adjustable Regulator DS009062-1 Full output current not available at high input-output voltages †Optional — improves transient response. Output capacitors in the range of 1 µF to 1000 µF of aluminum or tantalum electrolytic are commonly used to provide improved output impedance and rejection of transients. *Needed if device is more than 6 inches from filter capacitors. © 2000 National Semiconductor Corporation DS009062 www.national.com LM117HV/LM317HV Typical Applications (Continued) 5V Logic Regulator with Electronic Shutdown* Digitally Selected Outputs DS009062-3 *Min. output ≈ 1.2V DS009062-2 *Sets maximum VOUT www.national.com 2 LM117HV/LM317HV Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 4) Power Dissipation Input — Output Voltage Differential Internally limited +60V, −0.3V Operating Junction Temperature Range LM117HV LM317HV Storage Temperature Lead Temperature (Soldering, 10 sec.) ESD Tolerance (Note 5) −55˚C to +150˚C 0˚C to +125˚C −65˚C to +150˚C 300˚C 2000V Electrical Characteristics (Note 2) Parameter Li...

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